<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body,ul,li {
            margin: 0;
            padding: 0;
        }
        ul,ol {
            list-style: none;
        }
        div {
            background-color: red;
        }
    </style>
</head>
<body>
<div>aa</div>
</body>
</html>